Which of the following is true? a) by spontaneous we mean that the reaction is always endothermic since a significant amount of energy in the form of heat is absorbed. b) by spontaneous we mean that the reaction or process will always proceed to t (as written) even if very slowly. increasing the temperature always speed up the reaction, but it does not affect the spontaneity of the reaction. c) by spontaneous we mean that the reaction or process will always proceed to the left (as written) even if very slowly. increasing the temperature will allow the reaction to reach the equilibrium faster. d) by spontaneous we mean that the reaction or process will always proceed to the right (as written) even if very slowly. increasing the temperature may speed up the reaction. e)by spontaneous we mean that the reaction is always exothermic since a significant amount of energy in the form of heat is released.